Browsing by Author "Ellis, PJ"

Now showing 1 - 7 of 7
  • Thumbnail Image
    Item
    Computer-controlled diffractometer
    (Australian Atomic Energy Commission, 1968-06) Ellis, PJ; Pryor, AW
    A computer-controlled neutron diffractometer is described for the collection of Bragg intensities from a single crystal, the computer is a PDP-8 with a store of 4096 12-bit words, the diffractometer is a "4-circle" instrument with the axes driven by pulsed stepping-motors, while axis movement is checked by light-beam markers. The programs include procedures for centring reflections, rotating about the scattering vector, calculating the setting angles in the "bisecting" and "parallel" positions, scanning over diffraction peaks, measuring backgrounds and generating ranges of Miller indices. Two similar diffractometers may be operated simultaneously.
  • No Thumbnail Available
    Item
    Equipment and methodology for high precision, high throughput 14C AMS analyses at ANTARES
    (Elsevier, 1994-06-03) Smith, AM; Fink, D; Hotchkis, MAC; Jacobsen, GE; Lawson, EM; Shying, ME; Tuniz, C; Watt, GC; Fallon, J; Ellis, PJ
    The original Rutgers FN tandem accelerator has been modified for high-precision high-throughput AMS analyses at the ANTARES AMS Center. The status of this work and future plans are discussed, with emphasis on 14C. Isotopic ratios are measured at ANTARES by sequentially injecting stable isotopes and the radioisotope, and the systems developed for this purpose are described. Progress with a new injection platform and high intensity, multi-sample ion source is also given. © 1994 Elsevier B.V.
  • Thumbnail Image
    Item
    A multiplexed computer-computer, computer-device data link.
    (Australian Atomic Energy Commission, 1970-06) Ellis, PJ
    A data link is described which provides an access path between many computer based stations so that the facilities of a central large computing system can be used. It is operated as a party line with each sending-receiving station capable of communicating with any other station; subsequent data transfers can be in burst or unit byte modes. The hardware format is a 24 bit parallel data bus with a parity bit per eight bit byte, and five pairs of symmetrical asynchronous control lines used to govern data flow, status retrieval, etc. on the data bus. The link also allows remote peripheral devices to be attached to it and controlled by a particular computer.
  • Thumbnail Image
    Item
    A multistation pulse height analysis system based on a PDP9L computer.
    (Australian Atomic Energy Commission, 1976-06) Ellis, PJ
    A PDP9L computer is used as the basis for a multistation pulse height analysis system. Each station which is equipped with an analog-to-digital converter, a display and a keyboard-printer can perform the basic operations associated with a commercial hard-wired system. The stations are independent of one another but two or more accumulating or displaying simultaneously result in a slight increase in analog-to-digital converter dead time. The keyboard-printer operates in conversational mode with no output forthcoming if incorrect characters are entered. System procedures are initiated from the station keyboard to control the display, accumulate, integrate, and read and write functions as flexibly as possible without excessively increasing the program-to-data ratio for core usage. This system was designed to enable software to be modified when different procedures become necessary, and to enable adaptation of the available equipment to other modes of accumulation and display.
  • Thumbnail Image
    Item
    Programming the nova computer for dataway communication
    (Australian Atomic Energy Commission, 1973-08) Sanger, PL; Jones, CG; Ellis, PJ
    A general discussion of Dataway communication is presented followed by a description of the program sequences required to allow the NOVA computer to communicate with other computers on the Dataway. The Dataway sequences required to service terminals attached to the Dataway via Remote Teleprinter Interfaces are described. NOVA software developed to test the Dataway hardware is also described. The material presented here forms a basis for understanding Dataway communication and has proved invaluable for developing a new version of the ACL-NOVA system to support terminals attached to the Dataway via Remote Teleprinter Interfaces and to provide terminal users access to IBM360 disk storage.
  • Thumbnail Image
    Item
    SMUT - serial multi-user terminals system maintenance manual
    (Australian Atomic Energy Commission, 1980-07) Ellis, PJ; Thornton, RF
    This manual describes the function and conventions used in the SMUT system, particularly the operation of the terminal control unit and the separate card function blocks.
  • Thumbnail Image
    Item
    SMUT - Serial Multiple-User Terminals system
    (Australian Atomic Energy Commission, 1977-12) Ellis, PJ
    Serial data communications network capable of supporting up to 64 send-receive data terminals is described. Each terminal is serviced on a polling basis by a control unit that is interfaced to a minicomputer which has access to the AAEC Multiple User Dataway and its facilities. This serial link was developed to relieve the Dataway of the mundane servicing of slow, byte-oriented, input-output devices.